I agree that Filmmaking and Screenwriting is a dream of mine, and I too have been fascinated with the process of making a movie the way QT does. There is no doubt in my mind that he relies heavily on the use of Storyboards to make it all come together. I have tried my hand at making storyboards for my own use, and I can honestly say it is not an easy thing to do. I did find a mentor near Los Angeles, his work is featured here: https://famousframes.com/ He told me not to mention his name because he doesn't want others looking for "free" teaching but I think the site is worth checking out for inspiration.